trisodium 5-[[4-chloro-6-(methylphenylamino)-1,3,5-triazin-2-yl]amino]-4-hydroxy-3-[(1-sulphonato-2-naphthyl)azo]naphthalene-2,7-disulphonate

5-[[4-Chloro-6-(methylphenylamino)-1,3,5-triazin-2-yl]amino]-4-hydroxy-3-[(1-sulfo-2-naphtyl)azo]-2,7-naphthalenedisulfonic acid trisodium salt